Printing-telegraph system



March 5, 1929. WATSON 1,703,972

I PRINTING TELEGRAPH SYSTEM Filed April 25, 1926 W e/Var Edward/34471300 Patented Mar; 5, 1929.

UNITEDXSTATES 1,703,972 1 PATENT] orifice; I

EDWARD FISK WATSON, or LARCI-IMONQ'NEW YORK,"ASSIGNORI T0 AnnnioAn TELE- rnonn Ann TELEGRAPH COMPANY, A conronArronor sonn PRINTING-TELEGRAPH SYSTEM.

Application filed A rnes, 1926. Serial No. 194,149.

This invention relates to signaling sys tems and more particularly to printing telegraph systems wherein the perforated tape method of transmitting signals isemployed.

The principal object of the invention is to reduce current drain through the tape per which the transmission is effected by a per forated tape, the magnet for perforating the tape was maintained in an operated condition when any of the keys at the keyboard were held depressed and the complete release of the magnet depended upon the duration of the intervals between key operations.

According to the present invention the magnet is arranged to release as soon as it reaches its fully operated condition, regardless of whether a key at the transmitting key board is held depressed for an extended period or is operated by a staccato touch. This result is eilected by placing the magnet under the control of a quick-acting relay which is arranged to operate'in response to the actua tion of a key and to close a circuit both for maintaining itself in an operated condition and for operating the magnet. The magnet upon reaching its fully operated position opens its own operating circuit and releases,

independent of the nature of the touch applied to a key.

A further advantage of the invention ,resides in the prevention of the re-operation of the perforating magnet should a key be held depressed, and in this event a second relay is arranged to energize, when the magnet reaches itstully operated position, and to close a circuit extending through the contacts closed by the operated koy thereby shunting the relay controlling the operation ofthe magnet.

The above and other objects and features of this invention are set forth in the follow in g description and appended claims and may be more readily unlerstood if considered in conjunction with the accompanying drawing illustratinga specific embodiment of the invention, which shows a schematic of a printing telegraph transmitting set in which the transmission of signals may take place from a tape feed transmitter or directly from merely turninga switch, the same keyboard used for direct sending being also used (when a keyboard. The changet'rom one method of transmission to the other may be made by the switch is so set) for perforating the tape.

A printer adapted for use with this invention is disclosed in a copending application of H. Pfannenstiehl, December 21, 1923.

Referring to the Serial No. 681,921, filed drawing there is shown only that apparatus which is necessary for aclear understanding of the invention.

designates that part of theschematic in which is contained a keyboard and perforatoreir- .cuit; B designates diagranimatically the send ing equipment comprising the sending selectmg relays and the sending distributor; C,

also shown diagrammatically, the tape transmitter; and D a cam switch by which the mode of transm ssion is changed from the direct keyboardto the perforated tape, or vice versa, the switch being shown in a position arranged for the latter mode of trai'ismissioir,

In the part designated Ae is embodied the complete invention and will be hereinafter described .in detail, but a detailed description 01" theparts desi natedB C and'D is not L i b 7 7 deemed necessary inasmuch asthcy are well known in the art and do not enter intothe present invention. I

The invention, briefly described, embraces means for insuring the, positive operation and release of a perforating magnet for each operation of a key at a keyboard (not shown),the release being automaticallyei between a common contact 1 and a perforating magnet 4, the first winding serving to close an operating circuit for the magnet when the contact is closed and theseclondto hold the relay operated, should thecommon contact be subsequently opened, until the magnet has reached its fully operated'position. A

second relay 8, having two oil-normal grounded contacts, is also provided, and should the common contact remain closed after the mag net has reached its operated position, this relay would operate and close at one of its grounded contacts a locking circuit for itself and at the other a circuit shunting the relay 2,.the latter circuit preventing the reoperation of the magnet while the common. contact is closed.

Only so much of the schematic will be described as is directly concerned with the invention as here claimed. Assuming that the set is arranged, as shown, for the perforated tape method of transmision, the actuation of any of the keys at the keyboard closes the common contact 1. The closure of this contact closes the circuit estending from battery, contact 1, through the right-hand winding of punch relay 2, conductor 3, to ground at spring 10 of the cam, or shift, switch. Relay 52 operates and closes at its right armatures a circuit arranged in parallel paths extending respectively through the two coils of the perforator magnet 4t. This circuit is traceable from battery, through the windings, or coils, in parallel, of the perforator magnet l and the right armatures of relay 2, also in par allel, thence in a common path through the left-hand winding of relay 2, to ground at the normal contact 9 of the magnet. The closing of this circuit through the coils of the magnets in parallel insures the quick operation of the magnet, which is highly desirable to permit high speed operation of the keys. To provide against a staccato touch causing the release of relay 2 before the armature of magnet 4 has reached its fully operated position, relay 2 is locked through its lefthand winding in the above traced circuit.

The operation of magnet t opens the normal contact 9 and thereby releases relay 2, assuming that a key is not held depressed, and in turn the magnet itself is released. This operation is repeated for each character perforated, mechanical parts being positioned with respect to the tape so that each operation of. the magnet 4: causes a corresponding combination of perfm'ations to be made in the tape. The perforated tape is then run through transmitter C which sends the message signals, or characters, out over the line at a uniform speed. In this way with a supply of tape ahead, the line can be kept working continuously, even through the operator may stop for a short period. If the transmitter C catches up with the operator, thatis, if all the tape which has been perforated, has been drawn taut from the perforator, it is automa tically stopped by the tape hearing against the lever 6 causing thereby the opening contact 7 as is well known in the art.

If during the operation of the keyboard perforator, the operator should hold any of the keys depressed until the perforator magnet armature has moved contact spring 9 against its front contact, the latter will close a circuit through relay 8, energizing it. Relay 8 locks through afront contact until the operator releases the key thus opening the circuit ofrelay 8 at contact 1. Another contact closed on the energizing ofrelay 8, short-circuits the operating winding of relay 2, thus releasing the latter relay whose locking circuit is opened at contact 9. Thus relay 8 functions to prevent more than one operation of the perforating magnett for each depression of a key regardless of how long the operator holds the key depressed. Relay 2 prevents the re-energization of magnet 4 until the depressed key has been released and rcactuated.

What is claimed is:

1. In a tape perforating system, a keyboard, means for making perforations in a tape in various combinations, each combination relating to a key at said keyboard, and means for causing said first means to effeet its own release automatically should one of said keys be held depressed.

2. In a tape perforating system, perforating members, means for positioning said members in various combinations to perforate a tape, each combination being positioned individually, and automatically controlled means for effecting the permanent release of said perfo'ating members of a combination after the perforation is com.-

pleted when said positioningmeans are main-' tained operated continuously.

3. In a signaling system, means for transmitting signals, tape perforating means for making a permanent record ofsignals, and

automatically controlled means whereby said rating means operated by said keyboard for perforating a record of said combinations, and means whereby said tape perforating means effects its own release automatically when said keyboard means is maintained operated continuously.

5. Ina printing telegraph system, a plurality of selecting elements, keyboard operated means for positioning said selecting elements in various combinations, a common contact arranged to close for each combination, electromagnetic tape perforating means operated by'said keyboard means for perforating a record of said con'ibinations, and means actuated by the operation of said electromagnetic means for releasing said electromagnetic means and for preventing reoperation of the latter means when said contact maintained closed.

6. In a printing telegraph system, a plurality of selecting elements, a keyboard transllt) mitter for positioning said selecting elements in Various combinations, a contact common to said combinations, electromagnetic tape perforating means controlled by said contact for making a record of said combinations, and other electromagnetic means energized by the operation of said perforating means for releasing and preventing the reoperation of Said perforating means should said contact he maintained in an operated position.

7. In a printing telegraph system, a plurality ot' selecting elements, a keyboard transmitter for positioning said selecting elements in various combinations, a contact common to said combinations, electromagnetic recorder means controlled by said contact for making a record of said combinations and arranged to release itself automatically, other electromagnetic means responsive to the operation of said recorder means and'arranged to preventre-operation thereof should the said contact remain closed, and means for maintaining said second mentioned electromagnetic means operated independent of said recorder means when said contact is maintained closed.

In testimony whereof, I have signed my name to this specification this 22nd day of April, 1926.

EDWARD FISK lVATSON. 

